AY Honors/Woodworking/Answer Key

Woodworking

Collect and label five different kinds of wood used in woodworking. Tell the advantages and disadvantages of each.

Pine Pine is the most commonly available wood in North America. Its primary advantage is that it is relatively cheap. This is because is grows rather quickly. Another characteristic of pine is that it is soft. This can be both an advantage and a disadvantage. The advantage of a soft wood is that it is easy to work. The disadvantage is that it can break easily; delicate joinery that works fine in hardwoods will not hold up in pine.

Oak Oak is a very common hardwood. It is a tough wood that holds up well when stressed. It was often used in shipbuilding because of this touchness. Additionally, oak is fairly workable up until it is seasoned. Seasoned oak is very hard, which makes it difficult to cut, bore, plane or drive a nail through. This is an advantage in the finished product, but a disadvantage when trying to make something. When using oak, it is best to use unseasoned wood, and let it season once the object has been made.

Maple Maple is a light colored wood that can be found with highly figured grain. Figured grain is difficult to work with, but makes for a beautiful piece of furniture. Maple is also great for toy making because it does not easily splinter and stands up well to the abuse of even the most destructive of children. Maple is also commonly available, and thus, is relatively cheap for a hardwood.

Walnut Walnut is a dark hardwood. Its color is one of its chief advantages, and is probably wood most often "copied" by staining lighter, cheaper woods. Walnut also has figured grain and is fairly hard. It holds detail well, so it can be used in making intricate joints. It is also relatively expensive for a native hardwood.

Cherry Cherry is another hardwood that is commonly used in furniture making. Its color starts off as a medium brown and then slowly turns to a dark, beautiful reddish hue over time. It takes a nice finish, and has no need for stain. It is a little cheaper than walnut, but still fairly expensive.

Poplar Poplar is classfied as a hardwood, but it is relatively soft (though still harder than pine). Because of its softness, it is easy to work.

Elm Elm is a hardwood that is highly resistant to splitting. Because if this, it was the only wood used to make the hubs of wooden wagon wheels. It has a highly figured grain that entwines, and tangles itself in all directions - this is what makes it so difficult to split, but it also makes it difficult to plane.

List the basic hand and power tools necessary to do woodworking. Know how to safely use each tool and how to keep it in proper working order, including sharpening, if applicable.

Technically, no power tools are necessary for woodworking - everything can be done with handtools. Power tools can certainly make the job easier, but they are a relatively recent tool to arrive on the woodworking scene.

Handsaws

Handsaws come in many varieties, including the crosscut saw, rip saw, coping saw, tenon saw, backsaw, and dovetail saw. Each has its own special use. A crosscut saw is used for cutting across the grain of a piece of lumber. A rip saw is used for cutting along the grain. A coping saw is used for making curved cuts. A tenon saw is used for cutting tenons and other fine work. A backsaw is commonly used with a miter box and for small cutting jobs. A dovetail saw is used for cutting dovetail joints.

To use a crosscut or a rip saw, place the board on a supported surface at thigh-height (between the knee and hips). Grip the saw with the right hand (assuming right-handedness) and use the left knee to hold the board in place. Align the right shoulder, arm, and hand so that they are in line with the cut to be made. Begin with light strokes, noting that the saw cuts on the push stroke. As the cut progresses, keep an eye on the line, pulling the blade toward it. If this is to be a "finished" cut, you can score a "V" along the line first with a carton knife, and let the blade ride in the V groove. Score another line along the bottom of the board to prevent tear-out.

A saw is sharpened with a triangle file. The teeth of a rip saw (which cuts along the grain) are sharpened perpendicular to the blade. The teeth of crosscut saw are sharpened at an angle. Try to match the angle already ground into the teeth.

Maintain your saws by keeping them dry and sharp. Many tools (including saws) can be kept in great condition by wiping them down with a cloth and oil (or WD40) after each use. Coping saw blades can be obtained cheaply enough that it is easier to replace them than it is to sharpen them.

Chisels

Chisels can be used for making a variety of cuts in wood, from mortice and tenon joints to dovetail joints. They are often struck with a mallet or a hammer, but sometimes they are pushed by hand (watch for fingers!) to pare a joint or to smooth it.

To cut a mortice, choose a chisel that is as wide as the desired mortice. Motices should only be cut so that they are parallel to the grain of the wood. Mark the mortice out, and then place the chisel perpendicular to the grain, such that it covers the width of the mortice. Strike it with the mallet. Then move the chisel about an eight of an inch farther down the mortice and repeat. Each "bite" of the chisel will go a little deeper. When you get to the end of the mortice, reverse the chisel and take bits in the other direction (still perpendicular to the grain, but heading back toward the other end of the mortice). Continue until the mortice reaches the desired depth. Always cut the mortice first, and then size the tenon to fit.

To sharpen a chisel, hold it at a steady angle and drag it along a whet stone. If you use a grinder, be careful to not overheat the tip of the chisel as this will cause it to lose its tempering. It is better to sharpen them by hand with a whet stone, as it is very easy to overheat the blade with a grinder.

Store chisels in a way that will protect the cutting edge, either by covering them, or placing the edge where it will not come into contact with anything of equal (or greater) hardness than the blade. Like saws, chisels can be wiped down with cloth and oil to keep rust away.

Hand Planes

Hand Planes are one of the most satisfying tools to operate. Clamp the wood securely to a bench, and then push the plane along the grain. The blade should be adjusted so that it takes a thin shaving off the plank. The goal is to remove a continuous shaving the entire length of the board. Pay attention to how the grain runs - if it dives into the board, make sure the plane's blade does not try to pull it out. Doing so can ruin a board.

Once the blade has been removed from a plane, it can be sharpened in the same fashion as a chisel. It should be sharpened frequently, as this will improve its performance to a great extent.

A plane should be stored on its side to respect the blade.

Clamps

Clamps come in many varieties, from C-clamps to furniture clamps to bench dogs. Some say that it is nearly impossible to own too many C-clamps. When using a C-clamp in wood working be careful to not overtighten it. The clamping surface can easily leave a circular impression on the wood. If you need to get it really tight, place a piece of scrap between the clamping surface and your piece.

Furniture clamps (also called bar clamps) often have padded clamping surfaces, so making unwanted impressions on the wood is avoided. These are used for clamping large boards together, usually edge-to-edge.

Bench dogs are pieces of iron shaped like the number 7. The vertical portion of the clamp is inserted into a hole in a woodworker's bench, while the horizontal part is positioned over the piece. Then the top of the clamp is struck with a mallet. The clamp gets wedged into the hole, and the board will be held firmly in place for cutting or planing.

All clamps can be periodically wiped down with a cloth and oil to keep rust at bay.

Drills, Bits, and Braces

Drills, Bits, and Braces are used for boring holes in wood. A brace and bit is the "old-style" cordless drill. It is hand-powered. The brace holds the bit, and the woodworker's hand cranks it, inducing a rotation in the bit. To drill a clean hole with either a brace and bit or a drill and bit, hold the bit perpendicular to the board and start drilling. You can start a pilot hole with a nail or a punch first to keep the bit from wandering. There are two ways to prevent tear-out when boring a hole. The first method is to support the board and drill into the supporting material. For this to work, the board and its support must be firmly clamped together. The second method can be used if you have a bit with a point that is much narrower than the hole's diameter (such as a spade bit, a brad-point bit, or a bit with a screw-lead). Using such a bit, drill through the material until the tip comes through the other side. Then turn the board over and place the bit in this hole. Continue drilling toward the center.

Power Tools

Power Tools should be used with much care. It is difficult to cut a finger off with a hand saw, but a power saw can do this in an instant, and before the careless operator even feels any pain, a severed finger can drop to the floor. Power tools can greatly speed production of wood projects though, so it's certainly worth having them around. Read the owner's manual carefully before operating any piece of power equipment. Pay special attention to safety features, and do not try to defeat them! Pathfinders below the age of 16 should not use power tools. Remember, power tools are not required for woodworking, they only speed it along.

Know at least two ways to finish the edges of plywood.

Plywood is made by gluing multiple, thin sheets of wood together to form a thicker piece. The grain in each layer is alternated, so that it changes direction on every layer. This gives the wood much greater stability. Normally, wood will expand across the grain when subjected to different temperatures and especially humidities. By alternating the direction of grain, plywood does not suffer from uneven expansion to the same extent that regular lumber does.

Unfortunately, some layers often have knots in them, and the knots fall out before the layers are glued together. This leaves a void. In furniture-grade plywood these voids will be confined to the inner layers. In order to finish the edge of plywood, you can either fill these voids with a wood putty, or you can cover the edges with another material - typically, a veneer or a thin strip of hardwood.